Micrometer-caliper



F. H. MILLER.

MlcRoMETEn CAMPER.

APPLICATION FILED OCT. l5. 1920.

1,388,740. I PatentedAug.23,1921.

2 SHEETS-SHEET I.

. L Frank H,MILIEF F. H. MILLER.

MICROMETER CALIPER'.

APPLICATION FILED OCT. l5, 1920.

1 ,388,740, Patented Aug. 23, 1921.-

2 SHEETS-SHEET 2.

MM W y %a of earner aerien y FRANK H. MILLER, OF MILWAUKEE, WSCONSIN.

MICROMETER-CALIPER.

Specicaton of Letters Patent.

1Eat-ented Aug. 23,1521.

Application led October 15, 1920. Serial No. le).A

tain new and useful Improvements in Micrometer-Calipers; `and I dohereby declare thatthe following is a full, clear, and exactVdescription thereof. I

My invention.Y has reference to an 1myprovement in micrometer calipers,and more particularly to calipers having or adapted to havemeasurement-indicating means reading to one thousandths of an inch moreor less.

My object is to provide these improvements in such a manner that it maybe read more easily and quickly than others of its class. To accomplishthis, I have provided two sets of graduations, one on a rotating memberwhich indicates the decimal fractionsthat is, one-fourth, one-eighth,onesixteenth, 0r smaller common subdivisions of an inch, and the otheron a stationary member which indicates readings to one ten thousandthsof an inch.

A further object of my invention is to provide a measuring device of thecharacter described which is adapted to register exactly and withoutcomputation the common as well as decimal fractional parts of an inch. f

A further object of my invention is to provide an improved means formoving the work-engaging members of the tool into engagement with theWork.

In the accompanying drawings Figure 1 represents a longitudinalsectional view thereof, with a portion of the micrometer in elevation.`

Fig. 2 represents an elevation of the micrometer, showing the severalgraduations,

Fig. 3 is a plan view of the rotation thimble as extended in the flat,with the rows of numerals therein expressing different graduations,

Fig. 4 is an end view of the` rotating thimble showing the graduationsthereon, and

Fig. 5 is a similar view of the stationary barrel, showing thegraduations thereon.

Referring tothe drawings in detail, the

'numeral 1 designates the usual U-shaped frame, which is provided withthe anvil 2, same forming the stationary member of the caliper.

The opposite end of the U-shaped member hastherein an internal threadedopening' in which is screwed the threaded shank 3 of the disk 1, samehaving arranged thereon the tubular sieeve5,-the free end of which isthreaded internally and having screwed therein the member 6.

The member 3 is provided with a plurality of tapered fingers 7 which areadapted to bve wedged snugly against the lmeasuring end of the spindleS, which moves backand forth in the bore 9 of the disk and shank, by the.locking element 10. l

The sleeve 5 has movable thereon a second sleeve 11, the outer end ofwhich is closed and has secured thereto the spindle 8, a portion ofwhich is threaded, as at 12, and adapted to engage the threads of thebore within the member 6. The members 6 has extending outwardlytherefrom a split sleeve 13 which is externally threaded and providedwith the locking nut 14:. By this structure, compensation for wear isprovided.

Secured to the disk L1 is a tube member 15 which is provided with asight opening 16 as shown in Fig. 2.

f. TheV ends of both the sleeve 11 and the tube 15 are beveled and havethereon graduations, as shown in Figs. 4t and 5.

The sleeve 11 is provided with a milled exterior, as at 17.

Referring now to the scales or graduations upon the sleeve, l desire tocall your attention .first to Fig. 8, and in this I haveshown theAsleeve 11 as being divided into fourths, eighths, sixteenths,thirty-seconds and sixtyfourths of an inch.

These graduations cooperate with the graduations on the end of the tube15.

The graduations cnthe sleeve 5 indicate the thousandth part Aof an inchand coperate with the graduations on the end of the sleeve 11.

Thus, it will be apparent that as the sleeve 11 is rotated, thefractional part of an inch will be recorded by the graduations ofthesleeve being brought into line with the zero mark on thel beveled edgeof the tube 15, which is graduated in thousandths to indicatethevvariatiokns ofV the measurement of various settings. Also, by thecoperation of the graduations on the sleeve 5 and the endV of the sleeve11, the thousandths and decimals in various numbers are indicated. Forinstance, should the user desire to set the micrometer to ths of aninch, the sleeve ll is rotated until the numeral 5 on the 64th lineregisters With the Zero mark upon the beveled edge or the tube l5.

F rom the foregoing, it is thought that the constructiom operation andmany advantages of the invention described herein, will be apparent tothose skilled in the art, Without further description. lt is to beunderstood that various changes in the details of construction may beresorted to Without departing from the spirit or sacrioing any of theadvantages of the invention.

Having thus fully described my invention, what l claim as new, anddesire to secure by Letters Patent, is y l. micrometer calipercomprising a U- frame, a sleeve fixed in one end of said frame, a secondsleeve spaced from and inclosing the irst sleeve and having an openingtherein, a third sleeve movable between the first two and having ameasuring spindle fixed thereto, there being graduations upon the irstand third sleeves coperating With graduations upon the third and secondsleeve, the graduationsvon the first sleeve being visible through theopening in the seeond sleeve.

2. A micrometer caliper comprising a U- frame, a pair of spaced sleeves,one Within the other secured to one end o1 the frame, there being anopening in the outer sleeve, a sleeve movable between the tivo andhaving secured thereto a measuring spindle, said sleeve havinggraduations from fourths to sixty-fourths ot an inch adapted to coperatewith graduations in the `inner and outer sleeve, there being graduationsof one thousandths of an inch on the inner sleeve and eooperating withgraduations on the movable sleeve, the graduations on the sleeves beingvisible through the opening in the outer sleeve. n

In testimony that I'elaim the foregoing I have hereunto set my vhand atMilwaukee,

in the county of vMilwaukee and State of lVisconsin.

FRANK H. MILLER.

